Search found 779 matches

by dolmadis
Fri Jan 22, 2021 4:54 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Auto focussing by moving the camera
Replies: 3
Views: 159

Re: Auto focussing by moving the camera

In digital cameras, automatic focussing by changing the lens extension is really good, but it does result in changing the magnification. I am trying to make a mosaic of macro photos (up to 1200) in order to create a composite. But the surface is slightly uneven, so parts of the mosaic are slightly ...
by dolmadis
Thu Jan 21, 2021 10:17 am
Forum: Beginners Macro
Topic: Macro with inverted M12 and phone lenses anyone?
Replies: 4
Views: 3938

Re: Macro with inverted M12 and phone lenses anyone?

MarkSturtevant wrote:
Wed Jan 20, 2021 6:08 pm
But I think that other kinds of lenses on the end could work as well.
Would this be an "informed" but empirical project of substitution of the CCTV lens used by John?

If so where would we start?

Best

John
by dolmadis
Sat Jan 02, 2021 1:34 pm
Forum: Nature Photography -- Macro and Close-up
Topic: ...still macrophotos with wide-angle perspective...
Replies: 21
Views: 867

Re: ...still macrophotos with wide-angle perspective...

By moving the position of the lenses (by trial and error, because unfortunately I am not an expert in physical optics) I was able to increase the coverage circle of the relay lens, until to cover the MFT format. This is possible because the c-mount pinhole lenses are easily demountable. Again by tr...
by dolmadis
Sat Jan 02, 2021 8:38 am
Forum: Nature Photography -- Macro and Close-up
Topic: ...still macrophotos with wide-angle perspective...
Replies: 21
Views: 867

Re: ...still macrophotos with wide-angle perspective...

Thanks. That helps to know. In a few weeks I shall have the chance to see what it can do out of the box. I have the straight version.

BR, John
by dolmadis
Sat Jan 02, 2021 8:24 am
Forum: Nature Photography -- Macro and Close-up
Topic: ...still macrophotos with wide-angle perspective...
Replies: 21
Views: 867

Re: ...still macrophotos with wide-angle perspective...

https://www.photomacrography.net/forum/download/file.php?id=2232 That's the culprit, right there! I have a pinhole lens coming in the next month or so. A Cosmicar 9mm 3.4. So I wonder if you might be able to give me some measurements of the adjusted/final finished position of your configured lens? ...
by dolmadis
Thu Dec 31, 2020 3:14 am
Forum: Nature Photography -- Macro and Close-up
Topic: ...still macrophotos with wide-angle perspective...
Replies: 21
Views: 867

Re: ...still macrophotos with wide-angle perspective...

I shortened the lens tube, varying the distance between the different groups of inner lenses, increasing the coverage and adjusting the focal distance by attempts. Focusing (which is fixed in these lenses) is achieved with a focusable adapter cannibalized. The main advantage of this Wile Coyote len...
by dolmadis
Thu Dec 31, 2020 12:19 am
Forum: Photography Through the Microscope
Topic: Table salt
Replies: 3
Views: 294

Re: Table salt

Very nice Saul. An ancient floor tile from Pompeii?

Best, John
by dolmadis
Sat Dec 26, 2020 4:37 am
Forum: Photography Through the Microscope
Topic: New 3D lighting system (DIY)
Replies: 6
Views: 556

Re: New 3D lighting system (DIY)

Tonikon wrote:
Fri Dec 25, 2020 5:01 am
Hi everyone,
I tried to experiment with a 3D light system very different from those commonly used: the main innovation is a crystal dome placed between the light source and the condenser. .
Would be interested in seeing the "crystal dome".

BR

John
by dolmadis
Fri Dec 25, 2020 4:12 am
Forum: Nature Photography -- Macro and Close-up
Topic: ...still macrophotos with wide-angle perspective...
Replies: 21
Views: 867

Re: ...still macrophotos with wide-angle perspective...

Really good. What lens do you use please? (I cannot find the post.) Best, John Hi John...these pictures was made with a DIY lens deeply modified starting from a common C-Mount pinhole lens, radically adjusted to achieve coverage and focal distance compatible with the m4/3 format... Interesting .......
by dolmadis
Fri Dec 25, 2020 12:56 am
Forum: Nature Photography -- Macro and Close-up
Topic: ...still macrophotos with wide-angle perspective...
Replies: 21
Views: 867

Re: ...still macrophotos with wide-angle perspective...

Really good. What lens do you use please? (I cannot find the post.)

Best, John
by dolmadis
Tue Dec 22, 2020 8:11 am
Forum: Photography Through the Microscope
Topic: Onion
Replies: 9
Views: 592

Re: Onion

Thanks Saul. A quick read tells me that you have been as resourceful as usual and I expect there are some ingenious fabrications that you had to do.

Best, John
by dolmadis
Tue Dec 22, 2020 4:46 am
Forum: Photography Through the Microscope
Topic: Onion
Replies: 9
Views: 592

Re: Onion

Very nice Saul.

Can you tell us/show us more about Sanderson prisms please?

Thanks

John
by dolmadis
Mon Dec 21, 2020 12:33 am
Forum: Equipment Discussions
Topic: Scanner Nikkor 38mm f/2.8 LS30 Scanner Lens Tested
Replies: 49
Views: 2029

Re: Scanner Nikkor 38mm f/2.8 LS30 Scanner Lens Tested

Raf emailed me last night, he is going to make a new adapter with a deeper clamp, female 24.6mm to male M42 x 1 with a through hole, not a stop, and 3 set screws. If anyone in the US wants one, let me know and I can have an extra unit shipped in my box. Best, Robert Robert, which of the LS? lenses ...
by dolmadis
Sun Dec 20, 2020 11:28 am
Forum: Equipment Discussions
Topic: Scanner Nikkor 38mm f/2.8 LS30 Scanner Lens Tested
Replies: 49
Views: 2029

Re: Scanner Nikkor 38mm f/2.8 LS30 Scanner Lens Tested

Thanks for the references to your Tests, Robert.

I will give that seller a big miss !!

BR, John
by dolmadis
Sun Dec 20, 2020 10:14 am
Forum: Equipment Discussions
Topic: Scanner Nikkor 38mm f/2.8 LS30 Scanner Lens Tested
Replies: 49
Views: 2029

Re: Scanner Nikkor 38mm f/2.8 LS30 Scanner Lens Tested

.....The mounting arrangement that Robert posted in that link requires machining of the lens .... does the LS-50 mount into the RAF M42x1 adapter .... @For the Nikon LS-50 lens - there is another RAF adapter -- https://rafcamera.com/adapter-m26m-to-24-6mm-id Personally, I do not like the finish of ...